<template>
    <div class="List" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{city}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" @click="handleCityClick(item.name)" v-for="item of hotCities" :key="item.id">
                        <div class="button">{{item.name}}</div>
                    </div>
                </div>
            </div>
            <div class="area"
            v-for="(item,key) of cities"
            :key="key"
            :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list" v-for="innerItem of item" :key="innerItem.id" @click="handleCityClick(innerItem.name)">
                    <div class="item border-bottom">{{innerItem.name}}</div>
                </div>
            </div>
        </div>
    </div>
</template>
<script>
import Bscroll from 'better-scroll'
import {mapState, mapMutations} from 'vuex'

export default {
  name: 'CityList',
  props: {cities: Object, hotCities: Array, letter: String},
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  computed: {
    ...mapState(['city'])
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper, {click: true})
    this.scroll.refresh()
  },
  updated () {
    this.scroll.refresh()
  },
  activated () {
    this.scroll.refresh()
  }
}
</script>
<style lang="stylus" scoped>
@import '~assets/variles.styl'
.border-topbottom
    &:before
        border-color: #ccc
    &:after
        border-color: #ccc
.border-bottom
    &:before
        border-color: #ccc
.List
    position: absolute
    overflow hidden
    top: 1.72rem
    left: 0
    right: 0
    bottom: 0
    .title
        line-height: .54rem
        background: #eee
        color: #666
        padding-left: .2rem
        font-size: .26rem
    .button-list
        padding: .1rem .6rem .1rem .1rem
        overflow: hidden
        .button-wrapper
            float: left
            width: 33.3%
            .button
                margin: .1rem .1rem
                text-align: center
                border: .02rem solid #ccc
                padding: .1rem 0
                border-radius: .06rem
    .item-list
        .item
            line-height: .76rem
            padding-left: .2rem

</style>
